Abstract
Rationale: Cystic fibrosis (CF) is a heterogeneous disease with most mutations resulting in defective or missing protein. However, some mutations permit a residual function. The present study aimed to assess disease severity and clinical features of CF adults with residual function mutation (RFM). Methods: A secondary analysis of the Milan Adult CF Database enrolling CF adults according to 2017 CF Foundation guidelines and followed up from 2006 to 2016 was conducted. Patients with ≥1 RFM (Group 1) and those with either F508del homozygosis or ≥1 class I mutation (Group 2) were selected. Results: Out of 325 patients, 69 (21%) and 90 (28%) were included in Group 1 and 2, respectively. Group 1 patients were older at CF diagnosis (29 VS. 2 years, P Conclusion: Although less severe than “typical” CF, adults with RFM should commence individualized care and follow-up.
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